在 Java 中以并行数组的形式从文件中读取

Question

这是我从文件中读取并显示在控制台中的代码

    try
    {
        BufferedReader readFile = new BufferedReader(new FileReader("sales.txt"));
        String line = "";
        while((line = readFile.readLine()) != null)
        {
            String tmp[] = line.split(",");
            year = Integer.parseInt(tmp[0]);
            quarter = tmp[1];
            sales = Integer.parseInt(tmp[2]);
            //System.out.printf("Year: %stQuarter: %stSales: %dn",year,quarter,sales);   
        }
        readFile.close();
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }
    userInput.close();

在我名为"sales.txt"的文件中，我有这个：

2012年第1,9300季度

2012年第2季度，10225

2012，第三季度，12420

2012年第4季度，13250

2013年第1季度，10500

2013年第2季度，10900

2013，第三季度，11340

2013年第4季度，14600

现在我纠结于如何计算 2012 年和 2013 年第 4 季度的平均销售额

Answer 1

仅针对这种情况：

     float avg = 0;
     int counter = 0;
     try
        {
            BufferedReader readFile = new BufferedReader(new FileReader("sales.txt"));
            String line = "";
            while((line = readFile.readLine()) != null)
            {
                String tmp[] = line.split(",");
                year = Integer.parseInt(tmp[0]);
                quarter = tmp[1];
                sales = Integer.parseInt(tmp[2]);
                if(year == 2012 || year == 2013)
                   if(quarter.equals("Q4"){
                       counter++;
                       avg+=sales;
                   }
                //System.out.printf("Year: %stQuarter: %stSales: %dn",year,quarter,sales);   
            }
            avg /= counter; //Here there is the average! in avg
            readFile.close();
        }
        catch(IOException e)
        {
            e.printStackTrace();
        }
        userInput.close();

Answer 2

/

/或从文件中读取为数组

int[] year = new int [lineCount];
        String[] quarter = new String [lineCount];
        int[] sale = new int [lineCount];
        Scanner readFile = new Scanner(new File("sales.txt"));
        while(readFile.hasNextLine())
        {
            String salesRecords = readFile.nextLine();
            Scanner lineScan = new Scanner(salesRecords);
            lineScan.useDelimiter(",");
            year[i] = lineScan.nextInt();
            quarter[i] = lineScan.next();
            sale[i] = lineScan.nextInt();
            lineScan.close();
            i++;
        }

Answer 3

//Read from file and store data in Array List

    Scanner inputFile = new Scanner(new File("sales.txt"));
    ArrayList<Integer> yearsList = new ArrayList<Integer>();
    ArrayList<String> quartersList = new ArrayList<String>();
    ArrayList<Integer> salesList = new ArrayList<Integer>();
    while(inputFile.hasNextLine()){
        String line = inputFile.nextLine();
        Scanner scanner = new Scanner(line);
        scanner.useDelimiter(",");
        while(scanner.hasNextLine()){
            yearsList.add(scanner.nextInt());
            quartersList.add(scanner.next());
            salesList.add(scanner.nextInt());
        }
        scanner.close();
    }
    inputFile.close();
    //. Testing Can I read the file properly 
    // System.out.println(years+" n" + quarters + " n" + sales);
    //. Convert from ArrayList into Array 
    Integer[]yearsArray = yearsList.toArray(new Integer[yearsList.size()]); 
    String[] quartersArray = quartersList.toArray(new String[quartersList.size()]);
    Integer[]salesArray = salesList.toArray(new Integer[salesList.size()]);